feat(desktop): add offline cache and verified app updates

Clean release notes in Android and desktop update dialogs. Persist downloaded audio and offline playback events per server and user; add desktop update checks, checksum verification and installer launch.

apps/desktop/src-tauri/Cargo.toml

@@ -20,6 +20,7 @@ tauri-plugin-window-state = "2"
 tauri-plugin-single-instance = "2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
+sha2 = "0.10"
 tokio = { version = "1", features = ["net", "sync", "time"] }
 axum = "0.8"
 reqwest = { version = "0.12", default-features = false, features = ["rustls-tls", "stream", "json"] }

apps/desktop/src-tauri/src/lib.rs

@@ -1,6 +1,7 @@
 mod media;
 mod proxy;
 mod store;
+mod update;
 
 use media::Media;
 use proxy::Proxy;
@@ -110,6 +111,7 @@ pub fn run() {
     tauri::Builder::default()
         .plugin(tauri_plugin_single_instance::init(|app, _, _| show_main(app)))
         .plugin(tauri_plugin_window_state::Builder::default().build())
+        .manage(update::Updater::default())
         .setup(|app| {
             let saved = store::load_server(app.handle())?;
             let proxy = tauri::async_runtime::block_on(Proxy::start(saved.clone())).map_err(|e| e.to_string())?;
@@ -150,7 +152,8 @@ pub fn run() {
             Ok(())
         })
         .invoke_handler(tauri::generate_handler![
-            bootstrap, set_server, clear_server, token_get, token_set, token_clear, user_get, user_set, user_clear, media_set
+            bootstrap, set_server, clear_server, token_get, token_set, token_clear, user_get, user_set, user_clear, media_set,
+            update::update_check, update::update_install
         ])
         .run(tauri::generate_context!())
         .expect("desktop app failed to start");

apps/desktop/src-tauri/src/proxy.rs

@@ -86,7 +86,7 @@ fn cors(headers: &mut HeaderMap, origin: Option<&str>) {
     }
     headers.insert("access-control-allow-methods", HeaderValue::from_static("GET, HEAD, POST, PUT, PATCH, DELETE, OPTIONS"));
     headers.insert("access-control-allow-headers", HeaderValue::from_static("authorization, content-type, range, tus-resumable, upload-length, upload-offset, upload-metadata, upload-defer-length, x-requested-with"));
-    headers.insert("access-control-expose-headers", HeaderValue::from_static("content-range, accept-ranges, location, upload-offset, upload-length, tus-resumable, retry-after"));
+    headers.insert("access-control-expose-headers", HeaderValue::from_static("content-range, accept-ranges, location, upload-offset, upload-length, tus-resumable, retry-after, x-pipu-transport-error"));
 }
 
 async fn forward(State(proxy): State<Proxy>, request: Request) -> Response {
@@ -110,7 +110,11 @@ async fn forward(State(proxy): State<Proxy>, request: Request) -> Response {
     } else {
         match transfer(&proxy, request, tail).await {
             Ok(response) => response,
-            Err(_) => (StatusCode::BAD_GATEWAY, "Server unavailable").into_response(),
+            Err(_) => {
+                let mut response = (StatusCode::BAD_GATEWAY, "Server unavailable").into_response();
+                response.headers_mut().insert("x-pipu-transport-error", HeaderValue::from_static("1"));
+                response
+            },
         }
     };
     cors(response.headers_mut(), origin.as_deref());

apps/desktop/src-tauri/src/update.rs

@@ -0,0 +1,152 @@
+//! Server-proxied releases: never accept installer paths or commands from the UI.
+use serde::{Deserialize, Serialize};
+use sha2::{Digest, Sha256};
+use std::{io::Write, path::Path, time::Duration};
+use tauri::{AppHandle, Emitter, Manager, State};
+use tokio::sync::Mutex;
+
+#[derive(Clone, Deserialize, Serialize)]
+pub struct Build {
+    client: String,
+    version: String,
+    filename: String,
+    size: u64,
+    sha256: Option<String>,
+    download_url: String,
+}
+#[derive(Deserialize)]
+struct Catalog { version: String, notes_md: String, clients: Vec<Build> }
+#[derive(Clone, Serialize)]
+pub struct Release { build: Build, notes: String }
+#[derive(Default)]
+pub struct Updater { release: Mutex<Option<(String, Release)>> }
+
+fn client() -> &'static str {
+    if cfg!(target_os = "windows") { "windows" }
+    else if cfg!(target_os = "macos") { "macos" } else { "linux" }
+}
+
+fn version_code(raw: &str) -> Option<u64> {
+    let (base, rc) = raw.trim_start_matches('v').split_once("-rc.").map_or((raw.trim_start_matches('v'), "99"), |v| v);
+    let parts: Vec<u64> = base.split('.').map(str::parse).collect::<Result<_, _>>().ok()?;
+    let rc: u64 = rc.parse().ok()?;
+    if parts.len() != 3 || parts[0] > 1_000_000 || parts[1] > 99 || parts[2] > 99 || rc > 99 { return None; }
+    Some(parts[0] * 1_000_000 + parts[1] * 10_000 + parts[2] * 100 + rc)
+}
+
+fn http() -> Result<reqwest::Client, String> {
+    reqwest::Client::builder().redirect(reqwest::redirect::Policy::none())
+        .connect_timeout(Duration::from_secs(10)).read_timeout(Duration::from_secs(60))
+        .build().map_err(|e| e.to_string())
+}
+
+#[tauri::command]
+pub async fn update_check(app: AppHandle, updater: State<'_, Updater>) -> Result<Option<Release>, String> {
+    let mut saved = updater.release.lock().await;
+    *saved = None;
+    let server = crate::store::load_server(&app)?.ok_or("No server selected")?;
+    let catalog: Catalog = http()?.get(format!("{server}/api/v1/app/clients")).send().await
+        .map_err(|e| e.to_string())?.error_for_status().map_err(|e| e.to_string())?
+        .json().await.map_err(|e| e.to_string())?;
+    let Some(build) = catalog.clients.into_iter().find(|b| b.client == client()) else { return Ok(None); };
+    let current = version_code(&app.package_info().version.to_string()).ok_or("Invalid installed version")?;
+    if version_code(&build.version).ok_or("Invalid release version")? <= current { return Ok(None); }
+    let notes = if build.version == catalog.version { catalog.notes_md } else { String::new() };
+    let release = Release { build, notes };
+    validate_build(&release.build)?;
+    *saved = Some((server, release.clone()));
+    Ok(Some(release))
+}
+
+fn validate_build(build: &Build) -> Result<(), String> {
+    let safe_name = !build.filename.is_empty() && build.filename.bytes().all(|b| b.is_ascii_alphanumeric() || b"._-".contains(&b));
+    let extension = Path::new(&build.filename).extension().and_then(|s| s.to_str()).unwrap_or("");
+    let supported = match client() { "windows" => extension == "exe" || extension == "msi", "linux" => extension == "deb" || extension == "rpm", _ => extension == "dmg" };
+    let checksum = build.sha256.as_deref().is_some_and(|s| s.len() == 64 && s.bytes().all(|c| c.is_ascii_hexdigit()));
+    if !safe_name || !supported || !checksum || build.size == 0 || build.size > 1024 * 1024 * 1024 { return Err("Unsupported installer or missing checksum".into()); }
+    // Restrict to the existing, public Pipu client-file route; no arbitrary URL from a release.
+    if build.download_url != format!("/api/v1/app/download/{}/{}", client(), build.version) {
+        return Err("Invalid installer URL".into());
+    }
+    Ok(())
+}
+
+#[tauri::command]
+pub async fn update_install(app: AppHandle, updater: State<'_, Updater>) -> Result<(), String> {
+    let saved = updater.release.lock().await;
+    let (server, release) = saved.as_ref().ok_or("Check for an update first")?;
+    if crate::store::load_server(&app)?.as_ref() != Some(server) { return Err("Server changed".into()); }
+    let build = &release.build;
+    validate_build(build)?;
+    let dir = app.path().app_cache_dir().map_err(|e| e.to_string())?.join("updates");
+    std::fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
+    let path = dir.join(&build.filename);
+    let part = dir.join(format!("{}.part", uuid::Uuid::new_v4()));
+    let result = async {
+        let mut response = http()?.get(format!("{server}{}", build.download_url)).send().await
+            .map_err(|e| e.to_string())?.error_for_status().map_err(|e| e.to_string())?;
+        let mut file = std::fs::File::create(&part).map_err(|e| e.to_string())?;
+        let mut hash = Sha256::new();
+        let mut bytes = 0u64;
+        while let Some(chunk) = response.chunk().await.map_err(|e| e.to_string())? {
+            bytes += chunk.len() as u64;
+            if bytes > build.size { return Err("Installer exceeds expected size".to_string()); }
+            hash.update(&chunk);
+            file.write_all(&chunk).map_err(|e| e.to_string())?;
+            let _ = app.emit("update-progress", (bytes as f64 / build.size as f64).to_string());
+        }
+        if bytes != build.size || format!("{:x}", hash.finalize()) != build.sha256.as_ref().unwrap().to_lowercase() { return Err("Installer checksum mismatch".into()); }
+        file.sync_all().map_err(|e| e.to_string())?;
+        drop(file);
+        if path.exists() { std::fs::remove_file(&path).map_err(|e| e.to_string())?; }
+        std::fs::rename(&part, &path).map_err(|e| e.to_string())?;
+        launch(&path)?;
+        Ok(())
+    }.await;
+    let _ = std::fs::remove_file(&part);
+    result
+}
+
+fn launch(path: &Path) -> Result<(), String> {
+    #[cfg(target_os = "windows")]
+    {
+        use std::os::windows::process::CommandExt;
+        let mut command = if path.extension().and_then(|s| s.to_str()) == Some("msi") {
+            let mut cmd = std::process::Command::new("msiexec.exe"); cmd.arg("/i").arg(path); cmd
+        } else { std::process::Command::new(path) };
+        command.creation_flags(0x08000000).spawn().map_err(|e| e.to_string())?;
+    }
+    #[cfg(target_os = "linux")]
+    { std::process::Command::new("xdg-open").arg(path).spawn().map_err(|e| e.to_string())?; }
+    #[cfg(target_os = "macos")]
+    { std::process::Command::new("open").arg(path).spawn().map_err(|e| e.to_string())?; }
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn release_order() {
+        assert!(version_code("1.7.2") > version_code("1.7.2-rc.3"));
+        assert!(version_code("1.8.0-rc.1") > version_code("1.7.99"));
+        assert_eq!(version_code("1.7.1"), Some(1070199));
+        assert_eq!(version_code("1.7.100"), None);
+        assert_eq!(version_code("1.7.1;cmd"), None);
+    }
+    #[test]
+    fn installer_is_restricted_to_verified_server_asset() {
+        let extension = match client() { "windows" => "exe", "linux" => "deb", _ => "dmg" };
+        let mut build = Build { client: client().into(), version: "1.8.0".into(), filename: format!("pipu-1.8.0.{extension}"), size: 42,
+            sha256: Some("a".repeat(64)), download_url: format!("/api/v1/app/download/{}/1.8.0", client()) };
+        assert!(validate_build(&build).is_ok());
+        build.download_url = "https://other.example/installer.exe".into();
+        assert!(validate_build(&build).is_err());
+        build.download_url = format!("/api/v1/app/download/{}/1.8.0", client());
+        build.filename = "../installer.exe".into();
+        assert!(validate_build(&build).is_err());
+        build.filename = format!("pipu.{extension}");
+        build.sha256 = None;
+        assert!(validate_build(&build).is_err());
+    }
+}